blob: dec607c17b6434d6b8e5416060a0202bc4cb52f4 [file] [log] [blame]
John Johansenb5e95b42010-07-29 14:48:07 -07001/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor LSM hooks.
5 *
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
12 * License.
13 */
14
Casey Schaufler3c4ed7b2015-05-02 15:10:46 -070015#include <linux/lsm_hooks.h>
John Johansenb5e95b42010-07-29 14:48:07 -070016#include <linux/moduleparam.h>
17#include <linux/mm.h>
18#include <linux/mman.h>
19#include <linux/mount.h>
20#include <linux/namei.h>
21#include <linux/ptrace.h>
22#include <linux/ctype.h>
23#include <linux/sysctl.h>
24#include <linux/audit.h>
Serge E. Hallyn34867402011-03-23 16:43:17 -070025#include <linux/user_namespace.h>
John Johansenb5e95b42010-07-29 14:48:07 -070026#include <net/sock.h>
27
28#include "include/apparmor.h"
29#include "include/apparmorfs.h"
30#include "include/audit.h"
31#include "include/capability.h"
32#include "include/context.h"
33#include "include/file.h"
34#include "include/ipc.h"
35#include "include/path.h"
36#include "include/policy.h"
37#include "include/procattr.h"
38
39/* Flag indicating whether initialization completed */
40int apparmor_initialized __initdata;
41
42/*
43 * LSM hook functions
44 */
45
46/*
47 * free the associated aa_task_cxt and put its profiles
48 */
49static void apparmor_cred_free(struct cred *cred)
50{
John Johansen214beac2013-02-27 03:43:40 -080051 aa_free_task_context(cred_cxt(cred));
52 cred_cxt(cred) = NULL;
John Johansenb5e95b42010-07-29 14:48:07 -070053}
54
55/*
56 * allocate the apparmor part of blank credentials
57 */
58static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
59{
60 /* freed by apparmor_cred_free */
61 struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
62 if (!cxt)
63 return -ENOMEM;
64
John Johansen214beac2013-02-27 03:43:40 -080065 cred_cxt(cred) = cxt;
John Johansenb5e95b42010-07-29 14:48:07 -070066 return 0;
67}
68
69/*
70 * prepare new aa_task_cxt for modification by prepare_cred block
71 */
72static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
73 gfp_t gfp)
74{
75 /* freed by apparmor_cred_free */
76 struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
77 if (!cxt)
78 return -ENOMEM;
79
John Johansen214beac2013-02-27 03:43:40 -080080 aa_dup_task_context(cxt, cred_cxt(old));
81 cred_cxt(new) = cxt;
John Johansenb5e95b42010-07-29 14:48:07 -070082 return 0;
83}
84
85/*
86 * transfer the apparmor data to a blank set of creds
87 */
88static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
89{
John Johansen214beac2013-02-27 03:43:40 -080090 const struct aa_task_cxt *old_cxt = cred_cxt(old);
91 struct aa_task_cxt *new_cxt = cred_cxt(new);
John Johansenb5e95b42010-07-29 14:48:07 -070092
93 aa_dup_task_context(new_cxt, old_cxt);
94}
95
96static int apparmor_ptrace_access_check(struct task_struct *child,
97 unsigned int mode)
98{
John Johansenb5e95b42010-07-29 14:48:07 -070099 return aa_ptrace(current, child, mode);
100}
101
102static int apparmor_ptrace_traceme(struct task_struct *parent)
103{
John Johansenb5e95b42010-07-29 14:48:07 -0700104 return aa_ptrace(parent, current, PTRACE_MODE_ATTACH);
105}
106
107/* Derived from security/commoncap.c:cap_capget */
108static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
109 kernel_cap_t *inheritable, kernel_cap_t *permitted)
110{
111 struct aa_profile *profile;
112 const struct cred *cred;
113
114 rcu_read_lock();
115 cred = __task_cred(target);
116 profile = aa_cred_profile(cred);
117
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -0700118 /*
119 * cap_capget is stacked ahead of this and will
120 * initialize effective and permitted.
121 */
John Johansen25e75df2011-06-25 16:57:07 +0100122 if (!unconfined(profile) && !COMPLAIN_MODE(profile)) {
John Johansenb5e95b42010-07-29 14:48:07 -0700123 *effective = cap_intersect(*effective, profile->caps.allow);
124 *permitted = cap_intersect(*permitted, profile->caps.allow);
125 }
126 rcu_read_unlock();
127
128 return 0;
129}
130
Eric Paris6a9de492012-01-03 12:25:14 -0500131static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
132 int cap, int audit)
John Johansenb5e95b42010-07-29 14:48:07 -0700133{
134 struct aa_profile *profile;
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -0700135 int error = 0;
136
137 profile = aa_cred_profile(cred);
138 if (!unconfined(profile))
139 error = aa_capable(profile, cap, audit);
John Johansenb5e95b42010-07-29 14:48:07 -0700140 return error;
141}
142
143/**
144 * common_perm - basic common permission check wrapper fn for paths
145 * @op: operation being checked
146 * @path: path to check permission of (NOT NULL)
147 * @mask: requested permissions mask
148 * @cond: conditional info for the permission request (NOT NULL)
149 *
150 * Returns: %0 else error code if error or permission denied
151 */
152static int common_perm(int op, struct path *path, u32 mask,
153 struct path_cond *cond)
154{
155 struct aa_profile *profile;
156 int error = 0;
157
158 profile = __aa_current_profile();
159 if (!unconfined(profile))
160 error = aa_path_perm(op, profile, path, 0, mask, cond);
161
162 return error;
163}
164
165/**
166 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
167 * @op: operation being checked
168 * @dir: directory of the dentry (NOT NULL)
169 * @dentry: dentry to check (NOT NULL)
170 * @mask: requested permissions mask
171 * @cond: conditional info for the permission request (NOT NULL)
172 *
173 * Returns: %0 else error code if error or permission denied
174 */
175static int common_perm_dir_dentry(int op, struct path *dir,
176 struct dentry *dentry, u32 mask,
177 struct path_cond *cond)
178{
179 struct path path = { dir->mnt, dentry };
180
181 return common_perm(op, &path, mask, cond);
182}
183
184/**
185 * common_perm_mnt_dentry - common permission wrapper when mnt, dentry
186 * @op: operation being checked
187 * @mnt: mount point of dentry (NOT NULL)
188 * @dentry: dentry to check (NOT NULL)
189 * @mask: requested permissions mask
190 *
191 * Returns: %0 else error code if error or permission denied
192 */
193static int common_perm_mnt_dentry(int op, struct vfsmount *mnt,
194 struct dentry *dentry, u32 mask)
195{
196 struct path path = { mnt, dentry };
David Howellsc6f493d2015-03-17 22:26:22 +0000197 struct path_cond cond = { d_backing_inode(dentry)->i_uid,
198 d_backing_inode(dentry)->i_mode
John Johansenb5e95b42010-07-29 14:48:07 -0700199 };
200
201 return common_perm(op, &path, mask, &cond);
202}
203
204/**
205 * common_perm_rm - common permission wrapper for operations doing rm
206 * @op: operation being checked
207 * @dir: directory that the dentry is in (NOT NULL)
208 * @dentry: dentry being rm'd (NOT NULL)
209 * @mask: requested permission mask
210 *
211 * Returns: %0 else error code if error or permission denied
212 */
213static int common_perm_rm(int op, struct path *dir,
214 struct dentry *dentry, u32 mask)
215{
David Howellsc6f493d2015-03-17 22:26:22 +0000216 struct inode *inode = d_backing_inode(dentry);
John Johansenb5e95b42010-07-29 14:48:07 -0700217 struct path_cond cond = { };
218
David Howells7ac28562015-01-29 12:02:31 +0000219 if (!inode || !dir->mnt || !mediated_filesystem(dentry))
John Johansenb5e95b42010-07-29 14:48:07 -0700220 return 0;
221
222 cond.uid = inode->i_uid;
223 cond.mode = inode->i_mode;
224
225 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
226}
227
228/**
229 * common_perm_create - common permission wrapper for operations doing create
230 * @op: operation being checked
231 * @dir: directory that dentry will be created in (NOT NULL)
232 * @dentry: dentry to create (NOT NULL)
233 * @mask: request permission mask
234 * @mode: created file mode
235 *
236 * Returns: %0 else error code if error or permission denied
237 */
238static int common_perm_create(int op, struct path *dir, struct dentry *dentry,
239 u32 mask, umode_t mode)
240{
241 struct path_cond cond = { current_fsuid(), mode };
242
David Howells7ac28562015-01-29 12:02:31 +0000243 if (!dir->mnt || !mediated_filesystem(dir->dentry))
John Johansenb5e95b42010-07-29 14:48:07 -0700244 return 0;
245
246 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
247}
248
249static int apparmor_path_unlink(struct path *dir, struct dentry *dentry)
250{
251 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
252}
253
254static int apparmor_path_mkdir(struct path *dir, struct dentry *dentry,
Al Viro4572bef2011-11-21 14:56:21 -0500255 umode_t mode)
John Johansenb5e95b42010-07-29 14:48:07 -0700256{
257 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
258 S_IFDIR);
259}
260
261static int apparmor_path_rmdir(struct path *dir, struct dentry *dentry)
262{
263 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
264}
265
266static int apparmor_path_mknod(struct path *dir, struct dentry *dentry,
Al Viro04fc66e2011-11-21 14:58:38 -0500267 umode_t mode, unsigned int dev)
John Johansenb5e95b42010-07-29 14:48:07 -0700268{
269 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
270}
271
James Morris4d6ec102010-07-30 09:02:04 +1000272static int apparmor_path_truncate(struct path *path)
John Johansenb5e95b42010-07-29 14:48:07 -0700273{
David Howellsc6f493d2015-03-17 22:26:22 +0000274 struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
275 d_backing_inode(path->dentry)->i_mode
John Johansenb5e95b42010-07-29 14:48:07 -0700276 };
277
David Howells7ac28562015-01-29 12:02:31 +0000278 if (!path->mnt || !mediated_filesystem(path->dentry))
John Johansenb5e95b42010-07-29 14:48:07 -0700279 return 0;
280
281 return common_perm(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE,
282 &cond);
283}
284
285static int apparmor_path_symlink(struct path *dir, struct dentry *dentry,
286 const char *old_name)
287{
288 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
289 S_IFLNK);
290}
291
292static int apparmor_path_link(struct dentry *old_dentry, struct path *new_dir,
293 struct dentry *new_dentry)
294{
295 struct aa_profile *profile;
296 int error = 0;
297
David Howells7ac28562015-01-29 12:02:31 +0000298 if (!mediated_filesystem(old_dentry))
John Johansenb5e95b42010-07-29 14:48:07 -0700299 return 0;
300
301 profile = aa_current_profile();
302 if (!unconfined(profile))
303 error = aa_path_link(profile, old_dentry, new_dir, new_dentry);
304 return error;
305}
306
307static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry,
308 struct path *new_dir, struct dentry *new_dentry)
309{
310 struct aa_profile *profile;
311 int error = 0;
312
David Howells7ac28562015-01-29 12:02:31 +0000313 if (!mediated_filesystem(old_dentry))
John Johansenb5e95b42010-07-29 14:48:07 -0700314 return 0;
315
316 profile = aa_current_profile();
317 if (!unconfined(profile)) {
318 struct path old_path = { old_dir->mnt, old_dentry };
319 struct path new_path = { new_dir->mnt, new_dentry };
David Howellsc6f493d2015-03-17 22:26:22 +0000320 struct path_cond cond = { d_backing_inode(old_dentry)->i_uid,
321 d_backing_inode(old_dentry)->i_mode
John Johansenb5e95b42010-07-29 14:48:07 -0700322 };
323
324 error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0,
325 MAY_READ | AA_MAY_META_READ | MAY_WRITE |
326 AA_MAY_META_WRITE | AA_MAY_DELETE,
327 &cond);
328 if (!error)
329 error = aa_path_perm(OP_RENAME_DEST, profile, &new_path,
330 0, MAY_WRITE | AA_MAY_META_WRITE |
331 AA_MAY_CREATE, &cond);
332
333 }
334 return error;
335}
336
Al Virocdcf1162011-12-08 10:51:53 -0500337static int apparmor_path_chmod(struct path *path, umode_t mode)
John Johansenb5e95b42010-07-29 14:48:07 -0700338{
David Howells7ac28562015-01-29 12:02:31 +0000339 if (!mediated_filesystem(path->dentry))
John Johansenb5e95b42010-07-29 14:48:07 -0700340 return 0;
341
Al Virocdcf1162011-12-08 10:51:53 -0500342 return common_perm_mnt_dentry(OP_CHMOD, path->mnt, path->dentry, AA_MAY_CHMOD);
John Johansenb5e95b42010-07-29 14:48:07 -0700343}
344
Eric W. Biedermand2b31ca2012-06-01 16:14:19 -0600345static int apparmor_path_chown(struct path *path, kuid_t uid, kgid_t gid)
John Johansenb5e95b42010-07-29 14:48:07 -0700346{
David Howellsc6f493d2015-03-17 22:26:22 +0000347 struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
348 d_backing_inode(path->dentry)->i_mode
John Johansenb5e95b42010-07-29 14:48:07 -0700349 };
350
David Howells7ac28562015-01-29 12:02:31 +0000351 if (!mediated_filesystem(path->dentry))
John Johansenb5e95b42010-07-29 14:48:07 -0700352 return 0;
353
354 return common_perm(OP_CHOWN, path, AA_MAY_CHOWN, &cond);
355}
356
Al Viro3f7036a2015-03-08 19:28:30 -0400357static int apparmor_inode_getattr(const struct path *path)
John Johansenb5e95b42010-07-29 14:48:07 -0700358{
Al Viro3f7036a2015-03-08 19:28:30 -0400359 if (!mediated_filesystem(path->dentry))
John Johansenb5e95b42010-07-29 14:48:07 -0700360 return 0;
361
Al Viro3f7036a2015-03-08 19:28:30 -0400362 return common_perm_mnt_dentry(OP_GETATTR, path->mnt, path->dentry,
John Johansenb5e95b42010-07-29 14:48:07 -0700363 AA_MAY_META_READ);
364}
365
Eric Paris83d49852012-04-04 13:45:40 -0400366static int apparmor_file_open(struct file *file, const struct cred *cred)
John Johansenb5e95b42010-07-29 14:48:07 -0700367{
368 struct aa_file_cxt *fcxt = file->f_security;
369 struct aa_profile *profile;
370 int error = 0;
371
David Howells7ac28562015-01-29 12:02:31 +0000372 if (!mediated_filesystem(file->f_path.dentry))
John Johansenb5e95b42010-07-29 14:48:07 -0700373 return 0;
374
375 /* If in exec, permission is handled by bprm hooks.
376 * Cache permissions granted by the previous exec check, with
377 * implicit read and executable mmap which are required to
378 * actually execute the image.
379 */
380 if (current->in_execve) {
381 fcxt->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
382 return 0;
383 }
384
385 profile = aa_cred_profile(cred);
386 if (!unconfined(profile)) {
Al Viro496ad9a2013-01-23 17:07:38 -0500387 struct inode *inode = file_inode(file);
John Johansenb5e95b42010-07-29 14:48:07 -0700388 struct path_cond cond = { inode->i_uid, inode->i_mode };
389
390 error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0,
391 aa_map_file_to_perms(file), &cond);
392 /* todo cache full allowed permissions set and state */
393 fcxt->allow = aa_map_file_to_perms(file);
394 }
395
396 return error;
397}
398
399static int apparmor_file_alloc_security(struct file *file)
400{
401 /* freed by apparmor_file_free_security */
402 file->f_security = aa_alloc_file_context(GFP_KERNEL);
403 if (!file->f_security)
404 return -ENOMEM;
405 return 0;
406
407}
408
409static void apparmor_file_free_security(struct file *file)
410{
411 struct aa_file_cxt *cxt = file->f_security;
412
413 aa_free_file_context(cxt);
414}
415
416static int common_file_perm(int op, struct file *file, u32 mask)
417{
418 struct aa_file_cxt *fcxt = file->f_security;
419 struct aa_profile *profile, *fprofile = aa_cred_profile(file->f_cred);
420 int error = 0;
421
422 BUG_ON(!fprofile);
423
424 if (!file->f_path.mnt ||
David Howells7ac28562015-01-29 12:02:31 +0000425 !mediated_filesystem(file->f_path.dentry))
John Johansenb5e95b42010-07-29 14:48:07 -0700426 return 0;
427
428 profile = __aa_current_profile();
429
430 /* revalidate access, if task is unconfined, or the cached cred
431 * doesn't match or if the request is for more permissions than
432 * was granted.
433 *
434 * Note: the test for !unconfined(fprofile) is to handle file
435 * delegation from unconfined tasks
436 */
437 if (!unconfined(profile) && !unconfined(fprofile) &&
438 ((fprofile != profile) || (mask & ~fcxt->allow)))
439 error = aa_file_perm(op, profile, file, mask);
440
441 return error;
442}
443
444static int apparmor_file_permission(struct file *file, int mask)
445{
446 return common_file_perm(OP_FPERM, file, mask);
447}
448
449static int apparmor_file_lock(struct file *file, unsigned int cmd)
450{
451 u32 mask = AA_MAY_LOCK;
452
453 if (cmd == F_WRLCK)
454 mask |= MAY_WRITE;
455
456 return common_file_perm(OP_FLOCK, file, mask);
457}
458
459static int common_mmap(int op, struct file *file, unsigned long prot,
460 unsigned long flags)
461{
John Johansenb5e95b42010-07-29 14:48:07 -0700462 int mask = 0;
463
464 if (!file || !file->f_security)
465 return 0;
466
467 if (prot & PROT_READ)
468 mask |= MAY_READ;
469 /*
470 * Private mappings don't require write perms since they don't
471 * write back to the files
472 */
473 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
474 mask |= MAY_WRITE;
475 if (prot & PROT_EXEC)
476 mask |= AA_EXEC_MMAP;
477
John Johansenb5e95b42010-07-29 14:48:07 -0700478 return common_file_perm(op, file, mask);
479}
480
Al Viroe5467852012-05-30 13:30:51 -0400481static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
482 unsigned long prot, unsigned long flags)
John Johansenb5e95b42010-07-29 14:48:07 -0700483{
John Johansenb5e95b42010-07-29 14:48:07 -0700484 return common_mmap(OP_FMMAP, file, prot, flags);
485}
486
487static int apparmor_file_mprotect(struct vm_area_struct *vma,
488 unsigned long reqprot, unsigned long prot)
489{
490 return common_mmap(OP_FMPROT, vma->vm_file, prot,
491 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
492}
493
494static int apparmor_getprocattr(struct task_struct *task, char *name,
495 char **value)
496{
497 int error = -ENOENT;
John Johansenb5e95b42010-07-29 14:48:07 -0700498 /* released below */
499 const struct cred *cred = get_task_cred(task);
John Johansen214beac2013-02-27 03:43:40 -0800500 struct aa_task_cxt *cxt = cred_cxt(cred);
John Johansen77b071b2013-07-10 21:07:43 -0700501 struct aa_profile *profile = NULL;
John Johansenb5e95b42010-07-29 14:48:07 -0700502
503 if (strcmp(name, "current") == 0)
John Johansen77b071b2013-07-10 21:07:43 -0700504 profile = aa_get_newest_profile(cxt->profile);
John Johansenb5e95b42010-07-29 14:48:07 -0700505 else if (strcmp(name, "prev") == 0 && cxt->previous)
John Johansen77b071b2013-07-10 21:07:43 -0700506 profile = aa_get_newest_profile(cxt->previous);
John Johansenb5e95b42010-07-29 14:48:07 -0700507 else if (strcmp(name, "exec") == 0 && cxt->onexec)
John Johansen77b071b2013-07-10 21:07:43 -0700508 profile = aa_get_newest_profile(cxt->onexec);
John Johansenb5e95b42010-07-29 14:48:07 -0700509 else
510 error = -EINVAL;
511
John Johansen77b071b2013-07-10 21:07:43 -0700512 if (profile)
513 error = aa_getprocattr(profile, value);
514
515 aa_put_profile(profile);
John Johansenb5e95b42010-07-29 14:48:07 -0700516 put_cred(cred);
517
518 return error;
519}
520
521static int apparmor_setprocattr(struct task_struct *task, char *name,
522 void *value, size_t size)
523{
John Johansen3eea57c2013-02-27 03:44:40 -0800524 struct common_audit_data sa;
525 struct apparmor_audit_data aad = {0,};
John Johansenb5e95b42010-07-29 14:48:07 -0700526 char *command, *args = value;
527 size_t arg_size;
528 int error;
529
530 if (size == 0)
531 return -EINVAL;
532 /* args points to a PAGE_SIZE buffer, AppArmor requires that
533 * the buffer must be null terminated or have size <= PAGE_SIZE -1
534 * so that AppArmor can null terminate them
535 */
536 if (args[size - 1] != '\0') {
537 if (size == PAGE_SIZE)
538 return -EINVAL;
539 args[size] = '\0';
540 }
541
542 /* task can only write its own attributes */
543 if (current != task)
544 return -EACCES;
545
546 args = value;
547 args = strim(args);
548 command = strsep(&args, " ");
549 if (!args)
550 return -EINVAL;
551 args = skip_spaces(args);
552 if (!*args)
553 return -EINVAL;
554
555 arg_size = size - (args - (char *) value);
556 if (strcmp(name, "current") == 0) {
557 if (strcmp(command, "changehat") == 0) {
558 error = aa_setprocattr_changehat(args, arg_size,
559 !AA_DO_TEST);
560 } else if (strcmp(command, "permhat") == 0) {
561 error = aa_setprocattr_changehat(args, arg_size,
562 AA_DO_TEST);
563 } else if (strcmp(command, "changeprofile") == 0) {
564 error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
565 !AA_DO_TEST);
566 } else if (strcmp(command, "permprofile") == 0) {
567 error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
568 AA_DO_TEST);
John Johansen3eea57c2013-02-27 03:44:40 -0800569 } else
570 goto fail;
John Johansenb5e95b42010-07-29 14:48:07 -0700571 } else if (strcmp(name, "exec") == 0) {
John Johansen3eea57c2013-02-27 03:44:40 -0800572 if (strcmp(command, "exec") == 0)
573 error = aa_setprocattr_changeprofile(args, AA_ONEXEC,
574 !AA_DO_TEST);
575 else
576 goto fail;
577 } else
John Johansenb5e95b42010-07-29 14:48:07 -0700578 /* only support the "current" and "exec" process attributes */
579 return -EINVAL;
John Johansen3eea57c2013-02-27 03:44:40 -0800580
John Johansenb5e95b42010-07-29 14:48:07 -0700581 if (!error)
582 error = size;
583 return error;
John Johansen3eea57c2013-02-27 03:44:40 -0800584
585fail:
586 sa.type = LSM_AUDIT_DATA_NONE;
587 sa.aad = &aad;
588 aad.profile = aa_current_profile();
589 aad.op = OP_SETPROCATTR;
590 aad.info = name;
591 aad.error = -EINVAL;
592 aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
593 return -EINVAL;
John Johansenb5e95b42010-07-29 14:48:07 -0700594}
595
Jiri Slaby7cb4dc92010-08-11 11:28:02 +0200596static int apparmor_task_setrlimit(struct task_struct *task,
597 unsigned int resource, struct rlimit *new_rlim)
John Johansenb5e95b42010-07-29 14:48:07 -0700598{
John Johansen1780f2d2011-06-08 15:07:47 -0700599 struct aa_profile *profile = __aa_current_profile();
John Johansenb5e95b42010-07-29 14:48:07 -0700600 int error = 0;
601
602 if (!unconfined(profile))
John Johansen3a2dc832010-09-06 10:10:20 -0700603 error = aa_task_setrlimit(profile, task, resource, new_rlim);
John Johansenb5e95b42010-07-29 14:48:07 -0700604
605 return error;
606}
607
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -0700608static struct security_hook_list apparmor_hooks[] = {
Casey Schauflere20b0432015-05-02 15:11:36 -0700609 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
610 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
611 LSM_HOOK_INIT(capget, apparmor_capget),
612 LSM_HOOK_INIT(capable, apparmor_capable),
John Johansenb5e95b42010-07-29 14:48:07 -0700613
Casey Schauflere20b0432015-05-02 15:11:36 -0700614 LSM_HOOK_INIT(path_link, apparmor_path_link),
615 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
616 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
617 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
618 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
619 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
620 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
621 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
622 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
623 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
624 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
John Johansenb5e95b42010-07-29 14:48:07 -0700625
Casey Schauflere20b0432015-05-02 15:11:36 -0700626 LSM_HOOK_INIT(file_open, apparmor_file_open),
627 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
628 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
629 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
630 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
Casey Schauflere20b0432015-05-02 15:11:36 -0700631 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
632 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
John Johansenb5e95b42010-07-29 14:48:07 -0700633
Casey Schauflere20b0432015-05-02 15:11:36 -0700634 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
635 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
John Johansenb5e95b42010-07-29 14:48:07 -0700636
Casey Schauflere20b0432015-05-02 15:11:36 -0700637 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
638 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
639 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
640 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
John Johansenb5e95b42010-07-29 14:48:07 -0700641
Casey Schauflere20b0432015-05-02 15:11:36 -0700642 LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds),
643 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
644 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
645 LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec),
John Johansenb5e95b42010-07-29 14:48:07 -0700646
Casey Schauflere20b0432015-05-02 15:11:36 -0700647 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
John Johansenb5e95b42010-07-29 14:48:07 -0700648};
649
650/*
651 * AppArmor sysfs module parameters
652 */
653
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000654static int param_set_aabool(const char *val, const struct kernel_param *kp);
655static int param_get_aabool(char *buffer, const struct kernel_param *kp);
Rusty Russellb8aa09f2011-12-15 13:41:32 +1030656#define param_check_aabool param_check_bool
Luis R. Rodriguez9c278472015-05-27 11:09:38 +0930657static const struct kernel_param_ops param_ops_aabool = {
Jani Nikula6a4c2642014-08-27 06:21:23 +0930658 .flags = KERNEL_PARAM_OPS_FL_NOARG,
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000659 .set = param_set_aabool,
660 .get = param_get_aabool
661};
John Johansenb5e95b42010-07-29 14:48:07 -0700662
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000663static int param_set_aauint(const char *val, const struct kernel_param *kp);
664static int param_get_aauint(char *buffer, const struct kernel_param *kp);
Rusty Russellb8aa09f2011-12-15 13:41:32 +1030665#define param_check_aauint param_check_uint
Luis R. Rodriguez9c278472015-05-27 11:09:38 +0930666static const struct kernel_param_ops param_ops_aauint = {
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000667 .set = param_set_aauint,
668 .get = param_get_aauint
669};
John Johansenb5e95b42010-07-29 14:48:07 -0700670
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000671static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
672static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
Rusty Russellb8aa09f2011-12-15 13:41:32 +1030673#define param_check_aalockpolicy param_check_bool
Luis R. Rodriguez9c278472015-05-27 11:09:38 +0930674static const struct kernel_param_ops param_ops_aalockpolicy = {
Jani Nikula6a4c2642014-08-27 06:21:23 +0930675 .flags = KERNEL_PARAM_OPS_FL_NOARG,
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000676 .set = param_set_aalockpolicy,
677 .get = param_get_aalockpolicy
678};
John Johansenb5e95b42010-07-29 14:48:07 -0700679
680static int param_set_audit(const char *val, struct kernel_param *kp);
681static int param_get_audit(char *buffer, struct kernel_param *kp);
John Johansenb5e95b42010-07-29 14:48:07 -0700682
683static int param_set_mode(const char *val, struct kernel_param *kp);
684static int param_get_mode(char *buffer, struct kernel_param *kp);
John Johansenb5e95b42010-07-29 14:48:07 -0700685
686/* Flag values, also controllable via /sys/module/apparmor/parameters
687 * We define special types as we want to do additional mediation.
688 */
689
690/* AppArmor global enforcement switch - complain, enforce, kill */
691enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
692module_param_call(mode, param_set_mode, param_get_mode,
693 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
694
695/* Debug mode */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030696bool aa_g_debug;
John Johansenb5e95b42010-07-29 14:48:07 -0700697module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
698
699/* Audit mode */
700enum audit_mode aa_g_audit;
701module_param_call(audit, param_set_audit, param_get_audit,
702 &aa_g_audit, S_IRUSR | S_IWUSR);
703
704/* Determines if audit header is included in audited messages. This
705 * provides more context if the audit daemon is not running
706 */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030707bool aa_g_audit_header = 1;
John Johansenb5e95b42010-07-29 14:48:07 -0700708module_param_named(audit_header, aa_g_audit_header, aabool,
709 S_IRUSR | S_IWUSR);
710
711/* lock out loading/removal of policy
712 * TODO: add in at boot loading of policy, which is the only way to
713 * load policy, if lock_policy is set
714 */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030715bool aa_g_lock_policy;
John Johansenb5e95b42010-07-29 14:48:07 -0700716module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
717 S_IRUSR | S_IWUSR);
718
719/* Syscall logging mode */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030720bool aa_g_logsyscall;
John Johansenb5e95b42010-07-29 14:48:07 -0700721module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
722
723/* Maximum pathname length before accesses will start getting rejected */
724unsigned int aa_g_path_max = 2 * PATH_MAX;
725module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR);
726
727/* Determines how paranoid loading of policy is and how much verification
728 * on the loaded policy is done.
729 */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030730bool aa_g_paranoid_load = 1;
John Johansenb5e95b42010-07-29 14:48:07 -0700731module_param_named(paranoid_load, aa_g_paranoid_load, aabool,
732 S_IRUSR | S_IWUSR);
733
734/* Boot time disable flag */
Rusty Russell90ab5ee2012-01-13 09:32:20 +1030735static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
John Johansenc6116162013-07-10 21:03:43 -0700736module_param_named(enabled, apparmor_enabled, bool, S_IRUGO);
John Johansenb5e95b42010-07-29 14:48:07 -0700737
738static int __init apparmor_enabled_setup(char *str)
739{
740 unsigned long enabled;
Jingoo Han29707b22014-02-05 15:13:14 +0900741 int error = kstrtoul(str, 0, &enabled);
John Johansenb5e95b42010-07-29 14:48:07 -0700742 if (!error)
743 apparmor_enabled = enabled ? 1 : 0;
744 return 1;
745}
746
747__setup("apparmor=", apparmor_enabled_setup);
748
749/* set global flag turning off the ability to load policy */
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000750static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700751{
752 if (!capable(CAP_MAC_ADMIN))
753 return -EPERM;
754 if (aa_g_lock_policy)
755 return -EACCES;
756 return param_set_bool(val, kp);
757}
758
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000759static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700760{
761 if (!capable(CAP_MAC_ADMIN))
762 return -EPERM;
763 return param_get_bool(buffer, kp);
764}
765
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000766static int param_set_aabool(const char *val, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700767{
768 if (!capable(CAP_MAC_ADMIN))
769 return -EPERM;
770 return param_set_bool(val, kp);
771}
772
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000773static int param_get_aabool(char *buffer, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700774{
775 if (!capable(CAP_MAC_ADMIN))
776 return -EPERM;
777 return param_get_bool(buffer, kp);
778}
779
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000780static int param_set_aauint(const char *val, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700781{
782 if (!capable(CAP_MAC_ADMIN))
783 return -EPERM;
784 return param_set_uint(val, kp);
785}
786
Stephen Rothwell101d6c82010-08-02 12:00:43 +1000787static int param_get_aauint(char *buffer, const struct kernel_param *kp)
John Johansenb5e95b42010-07-29 14:48:07 -0700788{
789 if (!capable(CAP_MAC_ADMIN))
790 return -EPERM;
791 return param_get_uint(buffer, kp);
792}
793
794static int param_get_audit(char *buffer, struct kernel_param *kp)
795{
796 if (!capable(CAP_MAC_ADMIN))
797 return -EPERM;
798
799 if (!apparmor_enabled)
800 return -EINVAL;
801
802 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
803}
804
805static int param_set_audit(const char *val, struct kernel_param *kp)
806{
807 int i;
808 if (!capable(CAP_MAC_ADMIN))
809 return -EPERM;
810
811 if (!apparmor_enabled)
812 return -EINVAL;
813
814 if (!val)
815 return -EINVAL;
816
817 for (i = 0; i < AUDIT_MAX_INDEX; i++) {
818 if (strcmp(val, audit_mode_names[i]) == 0) {
819 aa_g_audit = i;
820 return 0;
821 }
822 }
823
824 return -EINVAL;
825}
826
827static int param_get_mode(char *buffer, struct kernel_param *kp)
828{
829 if (!capable(CAP_MAC_ADMIN))
830 return -EPERM;
831
832 if (!apparmor_enabled)
833 return -EINVAL;
834
John Johansen0d259f02013-07-10 21:13:43 -0700835 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
John Johansenb5e95b42010-07-29 14:48:07 -0700836}
837
838static int param_set_mode(const char *val, struct kernel_param *kp)
839{
840 int i;
841 if (!capable(CAP_MAC_ADMIN))
842 return -EPERM;
843
844 if (!apparmor_enabled)
845 return -EINVAL;
846
847 if (!val)
848 return -EINVAL;
849
John Johansen0d259f02013-07-10 21:13:43 -0700850 for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) {
851 if (strcmp(val, aa_profile_mode_names[i]) == 0) {
John Johansenb5e95b42010-07-29 14:48:07 -0700852 aa_g_profile_mode = i;
853 return 0;
854 }
855 }
856
857 return -EINVAL;
858}
859
860/*
861 * AppArmor init functions
862 */
863
864/**
865 * set_init_cxt - set a task context and profile on the first task.
866 *
867 * TODO: allow setting an alternate profile than unconfined
868 */
869static int __init set_init_cxt(void)
870{
871 struct cred *cred = (struct cred *)current->real_cred;
872 struct aa_task_cxt *cxt;
873
874 cxt = aa_alloc_task_context(GFP_KERNEL);
875 if (!cxt)
876 return -ENOMEM;
877
878 cxt->profile = aa_get_profile(root_ns->unconfined);
John Johansen214beac2013-02-27 03:43:40 -0800879 cred_cxt(cred) = cxt;
John Johansenb5e95b42010-07-29 14:48:07 -0700880
881 return 0;
882}
883
884static int __init apparmor_init(void)
885{
886 int error;
887
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -0700888 if (!apparmor_enabled || !security_module_enable("apparmor")) {
John Johansenb5e95b42010-07-29 14:48:07 -0700889 aa_info_message("AppArmor disabled by boot time parameter");
890 apparmor_enabled = 0;
891 return 0;
892 }
893
894 error = aa_alloc_root_ns();
895 if (error) {
896 AA_ERROR("Unable to allocate default profile namespace\n");
897 goto alloc_out;
898 }
899
900 error = set_init_cxt();
901 if (error) {
902 AA_ERROR("Failed to set context on init task\n");
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -0700903 aa_free_root_ns();
904 goto alloc_out;
John Johansenb5e95b42010-07-29 14:48:07 -0700905 }
Casey Schauflerb1d9e6b2015-05-02 15:11:42 -0700906 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks));
John Johansenb5e95b42010-07-29 14:48:07 -0700907
908 /* Report that AppArmor successfully initialized */
909 apparmor_initialized = 1;
910 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
911 aa_info_message("AppArmor initialized: complain mode enabled");
912 else if (aa_g_profile_mode == APPARMOR_KILL)
913 aa_info_message("AppArmor initialized: kill mode enabled");
914 else
915 aa_info_message("AppArmor initialized");
916
917 return error;
918
John Johansenb5e95b42010-07-29 14:48:07 -0700919alloc_out:
920 aa_destroy_aafs();
921
922 apparmor_enabled = 0;
923 return error;
John Johansenb5e95b42010-07-29 14:48:07 -0700924}
925
926security_initcall(apparmor_init);